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You need to iterate through all widgets and remove each of them:

for(int i = stackedWidget->count(); i >= 0; i--)
    QWidget* widget = stackedWidget->widget(i);
    stackedWidget->removeWidget(widget);
    widget->deleteLater();
                I'm not sure this will work... better do a while(stackedWidget->count() > 0){ QWidget* widget = stackedWidget->widget(0); /*....*/ }
– Mr. Developerdude
                Nov 4, 2017 at 1:07
I tried this example in Python
As a result of 5 pages, only 3 were deleted.
I did some checks and as result come up with an understanding, in a loop page with index 0 needs to be deleted all the time, because then you delete page 0, page 1 becomes 0
    pages = self.ui.stackedWidget_2.count()
    for i in range(pages):
        widget = self.ui.stackedWidget_2.widget(0);
        self.ui.stackedWidget_2.removeWidget(widget);
        
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